Wrench



Jan 23, 1923., L MSJPW,

R. BUKER.

WRENCH.

,FILED FEB. 24, 1922'.

mm mm.

l/VVE/VTOR ATTORNEYS Patented Jan. 23, 1%23.

nirisu hi l WRENCH.

Application filed February 24, 1922. Serial No. 538,854.

F all whom it may concern/.1

Beit known that I, RAY BUKER, a citizen of the United States, and a resident of Castle Rock, in the county of Cowlitz and State of Washington, have invented certain new and useful Improvements in Wrenches, oi? which the "following is a specification My invention relates to improvei'nents in wrenches and it consists substantially in the constructions, combinations and mode of operation herein described and claimed.

An object of the invention to provide a wrench which is designed to grip nuts or other objects by applying pressure on a lever after the jaws have been adjusted with the thumb screw to loosely fit the object to be gripped.

Other objects and advantages will appear in the liillowing specification, reference being had to the accompanying drawing, in which Fig. 1 is a side elevation of the improved wrench,

Fig. 2 is a central longitudinal section.

Fig. 3 is a front elevation of a part of the wrench, and

Fig. 4 is a cross section on the line 4-4: of Fig. 2. i

In its construction the improved wrench comprises a shank 1 which is U-shaped in cross section, A bar 2 slides within the shank. It has a face 8 against which a cam 4i bears. The cam is part of a lever 5 which is pivoted at 6 between ears 7 of the shank.

A spring 8 (Fig. 5).) iormally holds the lever 5 in the extended position shown in full lines, at which time a shoulder 9 on the lever engages the front face oi? the bar 2. Upon gripping the wrench and moving the lever to the dotted line position, the bar Qis moved forwardly within the lJ-shank 1., so that the aw 10 is made to trip an object 11 against a jaw 12 which is a part oi? the shank.

The bar 2 moves against the tension of an expansion spring 13. This spring is housed within the ll-shank and a recess 14; in the back of the bar. The end 15 of the bar is adapted to enter a recess 16 in the jaw 12 when the lever 5 is depressed. The end 15 is somewhat reduced for the purpose, and

the recess 16 acts as a guide for the slide bar. The jaw 10 is part of a carriage 17 which is moved along the shank 1 by turning a screw 18. This screw is suitably mounted on the carriage, and it engages corresponding teeth 19 on the exposed face of the bar 2. In operation, the carriage 1? is adjusted by means of the screw 18 until the jaw 10 loose- 1y grips the object 11. The operator then grasps the shank 1, depresses the handle 5 to the dotted line position and secures a firm grip on the object. It is the movement of the cam 4i against the face 3 oil? the bar that forces thebar along the shank and produces the secure grip of the jaw 10 on the object. The jaws can be adjusted with the thumb screw 18 so that they tighten on the object,when the lever 5 is in the most convenient place for the operator to grip. The position of the jaws does not determine the position of the lever. The leverage increases as the lever is moved toward the shank, making it possible to maintain a tight grip on the object with relatively light pressure on the lever. Obviously the jaws are made smooth when it is intended that the wrench be used for turning nuts or other flat objects, and rough or toothed when it is intended to be used for turning pipe, etc. T is various parts of the wrench may also be cast singly or manuiactured otherwise, practice may determine to be best.

I claim A wrench comprising a U-shank with a head having a recess, a recessed bar mounted in the shank with a portion adapted to be guided in the recess of the head, a carriage slidable on the shank, having a'jaw and a thumb screw by which the carriage is ad justed along the bar, a lever pivoted on the shank and having a cam engaging a taco of the bar to move the bar when the lever is depressed. a spring tending to normally keep the lever extended from the shank, a shoulder on the lever to engage the bar to limit the extension, and a spring in the bar-recess to oppose the shifting of the bar.

RAY BUKEH. 

